Toy building brick



FIG. 1 is a front perspective view of my ornamental design for toy building brick;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

CLAIM The ornamental design for toy building brick, as shown and described. 